CN106612070B - A kind of the load transient response Enhancement Method and system of voltage-mode buck converter - Google Patents
A kind of the load transient response Enhancement Method and system of voltage-mode buck converter Download PDFInfo
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- CN106612070B CN106612070B CN201510690108.2A CN201510690108A CN106612070B CN 106612070 B CN106612070 B CN 106612070B CN 201510690108 A CN201510690108 A CN 201510690108A CN 106612070 B CN106612070 B CN 106612070B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
- H02M1/0019—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being load current fluctuations
Abstract
The invention discloses a kind of load transient response Enhancement Methods of voltage-mode buck converter, comprising: carries out low-pass filtering to the output voltage Vout of voltage-mode buck converter, generates average voltage Vout1；The difference of Vout and Vout1 is calculated, and carries out the amplitude waveform for the difference being calculated to be converted to fluctuating current Itran；Slope processing is carried out to the amplitude of fluctuating current Itran, the transient response output voltage Vout of voltage-mode buck converter is generated according to obtained ramp signal.The present invention further simultaneously discloses a kind of load transient response enhancing system of voltage-mode buck converter.
Description
Technical field
The present invention relates to electric circuit electronics technical technologies more particularly to a kind of load transient response of voltage-mode buck converter to enhance
Method and system.
Background technique
With the rapid development of all kinds of electronics markets, the power supply chip skill of burning voltage can be provided for electronic product
Art is also being constantly progressive.The load of power supply chip is varied, and payload size variation is inevitable, the load transient response time and
Ability, which has become, measures the excellent key technical index of power supply chip.In order to guarantee the precision model of power supply chip output voltage
It encloses, needs power supply chip that there is good load transient response ability.
Buck converter is mainly used for that input voltage is relatively high, and the scene that output voltage is relatively low.General voltage-mode
Buck converter is mainly by oscillator, ramp generator, error amplifier, compensation network, pulse width generator, logic control, drive
Dynamic and power switch, output filtering, feedback network and some protective modules composition.Fixed frequency is generated by oscillator, it is synchronous
Control logic part and power tube switch；Ramp generator generates the ramp signal for being used for pulse-width controlled；Feedback network, error are put
The control core of big device and compensation network composition converter is used to change output voltage and amplify；Ramp signal and error amplification
Device signal compares by pulse width generator, generates pulse-width control signal；Pulse-width control signal combination oscillator signal passes through logic
And power switch, duty ratio is generated, duty ratio controls output power pipe switch, after filter network, exports burning voltage.
Traditional buck converter can export burning voltage, can satisfy load and change little or slow application
Scene；When requiring very high to voltage stability than very fast or rear class for load variation, traditional structure, which is difficult satisfaction design, to be wanted
It asks, this just needs to change framework or increases additional circuit to enhance load response ability.
Summary of the invention
In order to overcome the deficiencies of the prior art, an embodiment of the present invention is intended to provide a kind of load winks of voltage-mode buck converter
State responds Enhancement Method and system, and the load transient response ability of voltage-mode buck converter can be made to greatly improve, be effectively improved
The precision problem of output voltage caused by load variation.
The technical solution of the embodiment of the present invention is achieved in that
A kind of load transient response Enhancement Method of voltage-mode buck converter, which comprises
Low-pass filtering is carried out to the output voltage Vout of voltage-mode buck converter, generates average voltage Vout1；
The difference of Vout and Vout1 is calculated, and the amplitude waveform for the difference being calculated is carried out to be converted to fluctuation electricity
Flow Itran；
Slope processing is carried out to the amplitude of fluctuating current Itran, voltage-mode decompression is generated according to obtained ramp signal and is turned
The transient response output voltage Vout of parallel operation.
Preferably, slope processing is carried out to the amplitude of fluctuating current Itran, voltage is generated according to obtained ramp signal
The transient response output voltage Vout of mould buck converter, comprising:
Slope processing first is carried out to the amplitude of fluctuating current Itran, generates feedback dentation voltage Vramp；Further according to feedback
Pulsewidth in dentation voltage Vramp unit period, modulation generate the transient response output voltage Vout of voltage-mode buck converter.
Preferably, the method also includes: preset the first input threshold voltage Δ V1 and second input threshold value electricity
Press Δ V2；
The amplitude waveform of the difference that will be calculated carries out being converted to fluctuating current Itran, comprising:
When Vout-Vout1 is greater than Δ V1, the amplitude waveform of Vout-Vout1- Δ V1 is converted to the wave of respective waveforms
Streaming current Itran, the obtained fluctuating current Itran are forward current；
When the difference of Vout-Vout1 is greater than zero and is less than Δ V1, fluctuating current Itran is not generated；
When Vout1-Vout is greater than Δ V2, the amplitude waveform of Vout1-Vout- Δ V2 is converted to the wave of respective waveforms
Streaming current Itran, the obtained fluctuating current Itran are reverse current；
When the difference of Vout1-Vout is greater than zero and is less than Δ V2, fluctuating current Itran is not generated.
Preferably, the generation feedback dentation voltage Vramp includes:
The fluctuating current Itran is superimposed with preset reference current Iref and generates feedback current Iramp, according to
The amplitude of feedback current Iramp generates feedback dentation voltage Vramp.
Preferably, the method also includes: the difference according to feedback dentation voltage Vramp and feedback voltage V comp is raw
At the rectangular wave for modulation；Wherein, feedback voltage V comp passes through the output voltage to reference voltage Vref and by partial pressure
The difference of Vout amplifies to obtain, and part of the feedback dentation voltage Vramp greater than feedback voltage V comp is the height electricity of rectangular wave
Flat part.
Preferably, the first input threshold voltage Δ V1 and the second input threshold voltage Δ V2 are followed successively by first voltage
Compare amplifier and second voltage compares the offset voltage of amplifier；Wherein, the offset voltage is preset fixed value, described
The output stage asymmetry that offset voltage is compared two output mos pipes of the operational transconductance amplifier of amplifier by voltage generates.
A kind of load transient response enhancing system of voltage-mode buck converter, the system comprises low-pass filters, electricity
Pressure ratio is compared with amplifier, ramp generator and voltage generator element；Wherein,
The low-pass filter carries out low-pass filtering for the output voltage Vout to voltage-mode buck converter, generates
Average voltage Vout1；
The voltage compares amplifier, for calculating the difference of Vout and Vout1, and by the amplitude wave for the difference being calculated
Shape carries out being converted to fluctuating current Itran；
The ramp generator carries out slope processing for the amplitude to fluctuating current Itran；
The voltage generator element, for generating the transient response of voltage-mode buck converter according to obtained ramp signal
Output voltage Vout.
Preferably, it includes: that first voltage compares amplifier and second voltage compares amplifier that the voltage, which compares amplifier,；
Wherein, first voltage compares amplifier and presets the first input threshold voltage Δ V1, and it is pre- that second voltage compares amplifier
The second input of first setting threshold voltage Δ V2；
When Vout-Vout1- Δ V1 be greater than zero when, first voltage compare amplifier work, first voltage compare amplifier according to
The amplitude of Vout-Vout1- Δ V1 exports positive fluctuating current Itran；
When Vout1-Vout- Δ V2 be greater than zero when, second voltage compare amplifier work, second voltage compare amplifier according to
The amplitude of Vout1-Vout- Δ V2 exports reversed fluctuating current Itran.
Preferably, the ramp generator is specifically used for the fluctuating current Itran and preset benchmark electricity
It flows Iref superposition and generates feedback current Iramp, feedback dentation voltage Vramp is generated according to the amplitude of feedback current Iramp.
Preferably, the system also includes error amplifier EA, for according to reference voltage Vref and by partial pressure
Output voltage Vout generates feedback voltage V comp；
Correspondingly, the voltage generator element, for the difference according to feedback dentation voltage Vramp and feedback voltage V comp
Value generates pulse width signal, and the transient response output voltage for generating voltage-mode buck converter is modulated to the pulse width signal
Vout。
It preferably, is through overfill the system also includes compensation network compensation, the feedback voltage V comp
Repay the voltage of network compensation compensation.
Preferably, the first voltage compare amplifier and second voltage compare amplifier and include operational transconductance amplifier and
Circuit mirror current；
The output stage asymmetry of two output mos pipes of the operational transconductance amplifier generates offset voltage；Described first
The input of input threshold voltage Δ V1 and second threshold voltage Δ V2 is followed successively by that first voltage compares amplifier and second voltage compares fortune
The offset voltage put；
The circuit mirror current is located at the output end that voltage compares amplifier, and the electric current of the circuit mirror current is single
Direction.
The load transient response Enhancement Method and system of voltage-mode buck converter provided in an embodiment of the present invention, by right
The output voltage Vout of voltage-mode buck converter carries out low-pass filtering, generates average voltage Vout1, to Vout and Vout1 into
Row difference calculates, and the amplitude waveform for the difference being calculated is converted to fluctuating current；Pass through the amplitude to fluctuating current again
Slope processing is carried out, the transient response output voltage Vout of voltage-mode buck converter is generated according to obtained ramp signal, with
It realizes and the Real-time Feedback of the output voltage Vout value of voltage-mode buck converter is adjusted；The embodiment of the present invention realizes structure letter
Single, response quickly, can be such that the load transient response ability of voltage-mode buck converter greatly improves, and can effectively improve voltage
The problem of load transient response difference when mould is depressured, and the precision that can effectively improve the output voltage due to caused by load variation is asked
Topic.
Detailed description of the invention
Fig. 1 is the process flow signal of the load transient response Enhancement Method of voltage-mode of embodiment of the present invention buck converter
Figure；
Fig. 2 is that the load transient response of voltage-mode of embodiment of the present invention buck converter enhances the composed structure signal of system
Figure；
Fig. 3 is that the first voltage of the embodiment of the present invention compares the structural schematic diagram of amplifier；
Fig. 4 is that the second voltage of the embodiment of the present invention compares the structural schematic diagram of amplifier；
Fig. 5 is the structural schematic diagram of the ramp generator ramp of the embodiment of the present invention；
Transient changing waveform diagram when Fig. 6 is the load decline of the embodiment of the present invention；
Fig. 7 is the transient changing waveform diagram when load of the embodiment of the present invention rises.
Specific embodiment
In embodiments of the present invention, it after low-pass filtered to the output voltage Vout of voltage-mode buck converter, generates flat
Equal voltage Vout1；Difference calculating is carried out to Vout and Vout1, and carries out the amplitude waveform of obtained difference to be converted to wave
Streaming current Itran；Slope processing is carried out to the amplitude of fluctuating current Itran, voltage-mode drop is generated according to obtained ramp signal
The transient response output voltage Vout of pressure converter.
Here, the transient response output voltage Vout for carrying out slope processing and generating voltage-mode buck converter, comprising:
Slope processing first is carried out to the amplitude of fluctuating current Itran, generates feedback dentation voltage Vramp；Further according to feedback dentation voltage
Pulsewidth in Vramp unit period, modulation generate the transient response output voltage Vout of voltage-mode buck converter.
The present invention is described in further detail with reference to the accompanying drawings and examples.
The load transient response Enhancement Method of a kind of voltage-mode buck converter provided in an embodiment of the present invention, such as Fig. 1 institute
Show, the process flow of this method the following steps are included:
S1: carrying out low-pass filtering (low-pass filtering is R11 and C11) for the output voltage Vout of voltage-mode buck converter,
Generate average voltage Vout1；
S2: the difference of Vout and Vout1 is calculated, and the amplitude waveform for the difference being calculated is converted, obtains wave
Streaming current Itran；
Here it is possible to comparing amplifier using voltage completes the electric current conversion for subtracting the amplitude waveform of the difference of Vout1 to Vout,
Specifically: voltage compares amplifier and first carries out difference calculating to Vout and Vout1, and the amplitude curve being calculated is converted to phase
Answer the current curve of waveform.
S3: carrying out slope processing to the amplitude of fluctuating current Itran, generates voltage-mode decompression according to obtained ramp signal
The transient response output voltage Vout of converter；
This step specifically includes: first carrying out slope processing to the amplitude of fluctuating current Itran, feedback dentation voltage is generated
Vramp；Further according to the pulsewidth in feedback dentation voltage Vramp unit period, modulation generates the transient state of voltage-mode buck converter
Respond output voltage Vout.
Here it is possible to slope processing be carried out using ramp generator ramp, by fluctuating current Itran periodically to oblique
The capacitor of slope generator ramp charges, and obtains the voltage ramp curve in the unit period；Wherein, certain moment is being just
Bigger to output electric current, the slope of the voltage ramp of capacitor is bigger, conversely, the slope of the voltage ramp of capacitor is smaller.
Meanwhile the pulsewidth generating device that voltage generator element can be used carries out rectangular wave to feedback dentation voltage Vramp
Processing, obtains corresponding pulsewidth；The transient state sound for generating voltage-mode buck converter is modulated to pulsewidth by logic drive circuit
Answer output voltage Vout.It specifically, can feedback dentation voltage Vramp and voltage-mode buck converter is preset or root
It is compared according to the base value of output voltage Vout feedback, the part that Vramp is greater than base value is the high level of rectangular wave, to obtain
Corresponding pulsewidth is modulated pulsewidth and generates transient response output voltage Vout.
Further more accurately to obtain output pulsation electric current Itran, the first input threshold voltage Δ V1 can be preset
With the second input threshold voltage Δ V2；Correspondingly, the amplitude waveform of the difference that will be calculated carries out being converted to fluctuation
Electric current Itran, comprising:
When Vout-Vout1 is greater than Δ V1, the amplitude waveform of Vout-Vout1- Δ V1 is converted to the wave of respective waveforms
Streaming current Itran, the obtained fluctuating current Itran are forward current；
When the difference of Vout-Vout1 is greater than zero but is less than Δ V1, fluctuating current Itran is not generated；
When Vout1-Vout is greater than Δ V2, the amplitude waveform of Vout1-Vout- Δ V2 is converted to the wave of respective waveforms
Streaming current Itran, the obtained fluctuating current Itran are reverse current；
When the difference of Vout1-Vout is greater than zero but is less than Δ V2, fluctuating current Itran is not generated.
Here, the first input threshold voltage Δ V1 and the second input threshold voltage Δ V2 is respectively that first voltage compares
Amplifier and second voltage compare the offset voltage of amplifier, wherein offset voltage is preset fixed value, and voltage compares amplifier
The output stage asymmetry of two output mos pipes of operational transconductance amplifier generate the offset voltage.Wherein, fluctuating current
Itran is the image current that can drive other equipment.
The fluctuating current Itran is superimposed with preset reference current Iref generates feedback current Iramp, according to anti-
The amplitude of supply current Iramp generates feedback dentation voltage Vramp.It further, can be according to feedback dentation voltage Vramp and feedback
The difference of voltage Vcomp (i.e. the preset base value of voltage-mode buck converter) generates the rectangular wave for modulation, to adjust
Save output duty cycle.Wherein, the difference that feedback voltage V comp passes through the output voltage Vout to reference voltage Vref and by decompression
Value amplifies to obtain, and part of the feedback dentation voltage Vramp greater than feedback voltage V comp is the high level part of rectangular wave；
The feedback voltage V comp is the voltage through overcompensation, and offset voltage may make the waveform of feedback voltage V comp gentler.
The load transient response of the voltage-mode buck converter of application of the embodiment of the present invention enhances system, as shown in Fig. 2, institute
The system of stating includes: that low-pass filter, voltage compare amplifier, ramp generator ramp, voltage generator element；Wherein,
The low-pass filter, including C11 and R11 are carried out for the output voltage Vout to voltage-mode buck converter
Low-pass filtering generates average voltage Vout1；
The voltage compares amplifier, for calculating the difference of Vout and Vout1, and by the amplitude wave for the difference being calculated
Shape carries out being converted to fluctuating current Itran；
The ramp generator carries out slope processing for the amplitude to fluctuating current Itran；
The voltage generator element, for generating the transient response of voltage-mode buck converter according to obtained ramp signal
Output voltage Vout.
Specifically, the ramp generator carries out slope processing to the amplitude of fluctuating current Itran, feedback dentation electricity is generated
Press Vramp；
Correspondingly, the voltage generator element, for the difference according to feedback dentation voltage Vramp and feedback voltage V comp
Value generates pulse width signal, and the transient response output voltage for generating voltage-mode buck converter is modulated to the pulse width signal
Vout；
Wherein, the voltage generator element can further comprise pulsewidth generating device PWM and logic drive circuit (Logic+
Driver), rectangular wave processing is carried out to feedback dentation voltage Vramp by pulsewidth generating device, according to feedback dentation voltage
Vramp obtains corresponding pulsewidth to the difference of feedback voltage V comp；Obtained pulsewidth is modulated by logic drive circuit, it is raw
At the transient response output voltage Vout of voltage-mode buck converter.
It includes that first voltage compares amplifier gm1 and second voltage compares amplifier gm2, specific structure that the voltage, which compares amplifier,
Referring to Fig. 3 and Fig. 4；And first voltage compares amplifier gm1 and presets the first input threshold voltage Δ V1, second voltage compares fortune
It puts gm2 and presets the second input threshold voltage Δ V2；
It carries out the amplitude waveform for the difference being calculated to be converted to fluctuating current correspondingly, the voltage compares amplifier
Itran is specifically included:
When Vout-Vout1- Δ V1 be greater than 0 when, first voltage compare amplifier work, first voltage compare amplifier according to
The amplitude of Vout-Vout1- Δ V1 exports positive fluctuating current Itran, it may be assumed that electric current outflow first voltage compares the direction of amplifier
For forward direction；
When Vout1-Vout- Δ V2 be greater than 0 when, second voltage compare amplifier work, second voltage compare amplifier according to
The amplitude of Vout1-Vout- Δ V2 exports reversed fluctuating current Itran, it may be assumed that electric current flows into the direction that second voltage compares amplifier
It is reversed.
The first voltage compare amplifier gm1 and second voltage to compare amplifier gm2 include operational transconductance amplifier and mirror
The output stage asymmetry of image current circuit, two output mos pipes of the operational transconductance amplifier generates offset voltage；Wherein,
The first input threshold voltage Δ V1 and the second input threshold voltage Δ V2 is followed successively by first voltage and compares amplifier and the second electricity
Offset voltage of the pressure ratio compared with amplifier；The circuit mirror current is located at the output end that voltage compares amplifier, and circuit mirror current
In electric current be one direction.Wherein, fluctuating current Itran is the image current that can drive other equipment.
Specifically, first voltage compares the structure of amplifier gm1 referring to shown in Fig. 3, and in design, output stage M16=n-1,
M18=n, in this way, the number difference of output stage makes output end generate fixed offset voltage, i.e., the first input threshold voltage Δ
V1.When Vout transient changing value (Vout-Vout1) is less than Δ V1, gm1 is in large signal operation state, due to close to the end VIN
Metal-oxide-semiconductor output stage M18 ratio M16 high, therefore the value of voltage output point Vgm1 is VIN, at this time output pulsation electric current Itran=0；When
Vout transient changing value (Vout-Vout1) is greater than Δ V1, i.e., when Vout moment gets higher, the value of Vout-Vout1 is bigger, and voltage is defeated
The voltage of point Vgm1 reduces out, and M19 and M10 is connected in the pressure difference of VIN and Vgm1, so that first voltage compares at amplifier gm1
In magnifying state.M19 and M10 forms circuit mirror current, the size of current of the amplitude control M19 of output voltage Vgm1, input
Pressure difference (Vout-Vout1) it is bigger, the amplitude of output voltage Vgm1 is lower, and the electric current (Itran) of output is bigger.Wherein, for
The part for generating offset voltage can also be mismatched using the two-part metal-oxide-semiconductor number of M11 and M12 of input stage, to generate
Offset voltage Δ V1.Wherein, first voltage compares when amplifier gm1 only has Vout-Vout1 greater than Δ V1 and could work, if being less than
The metal-oxide-semiconductor of Δ V1 then circuit mirror current is in the state reversely ended.
Second voltage compares the structure of amplifier gm2 referring to shown in Fig. 4, similarly, structure amplifier compared with first voltage
Structure is close, and the main distinction is that the voltage reference points of circuit mirror current are different, specifically: the output stage M26=in design
N, M28=n-1 generate fixed offset voltage, i.e., the second input threshold voltage Δ V2.When Vout transient changing difference
(Vout1-Vout) it is less than Δ V2, gm2 is in large signal operation state, due to the metal-oxide-semiconductor output stage M26 ratio close to ground terminal
M28 high, therefore the value of voltage output point Vgm2 is GND, at this time output pulsation electric current Itran=0；When Vout transient changing value
(Vout1-Vout) when being greater than Δ V2, i.e., when Vout moment is lower, the value of Vout1-Vout is bigger, the electricity of voltage output point Vgm2
Pressure increases, and M29 and M20 is connected in the pressure difference of Vgm2 and ground wire, so that second voltage, which compares amplifier gm2, is in magnifying state.
M19 and M10 forms circuit mirror current, the size of current of the amplitude control M19 of output voltage Vgm2, the pressure difference of input
(Vout1-Vout) bigger, the amplitude of output voltage Vgm2 is higher, and the electric current (Itran) of output is bigger.Wherein, for generating mistake
Adjusting the part of voltage can also be mismatched using the two-part metal-oxide-semiconductor number of M21 and M22 of input stage, to generate imbalance electricity
Press Δ V2.Wherein second voltage compares when amplifier gm2 only has Vout1-Vout greater than Δ V2 and could work, the mirror if being less than Δ V2
The metal-oxide-semiconductor of image current circuit is in the state reversely ended.
As shown in figure 5, the structural schematic diagram of the ramp generator ramp of the embodiment of the present invention, ramp generator ramp pass through
Ramp signal is generated to C1 and C2 difference charge and discharge.The duty ratio of the Clk1 clock of the embodiment of the present invention is 50%, when by clk
The frequency dividing of clock 2 obtains.When clk1 rising edge arrives, s1 is opened, and s2 closure, Buf drives C1, and the voltage of C1 is made to be equal to Vref.When
When clk1 failing edge arrives, s1 closure, s2 is opened, and Buf 1 drives C2, and the voltage of C2 is made to be equal to Vref；C1 has begun at this time
It is charged by feedback current Iramp and generates feedback dentation voltage Vramp.When next clk1 rising edge arrives, s1 is opened, s2
Closure, Buf drive C1, and the voltage of C1 is made to be equal to Vref；C2, which has begun, at this time is charged by feedback current Iramp and generates feedback
Dentation voltage Vramp.
Repeatedly, alternately switch charge and discharge capacitance mode, to mono- clk clock cycle of Buf time to capacitor into
Row charging is to stablize the initial voltage of capacitor, and single capacitor can be prevented in switching transient voltage, and there are no stabilizations to begin to make
With ramp voltage is generated, avoid the initial voltage of two continuous ramp signals unequal, to cause the duty ratio of PWM wave not
Accurately.
Since the lower directly application of the amplitude of fluctuating current Itran is inconvenient, load capacity is weak, therefore, the slope hair
The fluctuating current Itran is first superimposed with preset reference current Iref and generates feedback current Iramp by raw device ramp, then
Feedback dentation voltage Vramp is generated according to the amplitude of feedback current Iramp.
Similarly, the output voltage the system also includes error amplifier (EA), reference voltage Vref and by decompression
Vout generates feedback voltage V comp by error amplifier；Correspondingly, pulsewidth generating device is according to feedback dentation voltage Vramp
The rectangular wave for modulation is generated with the difference of feedback voltage V comp, feedback dentation voltage Vramp is greater than feedback voltage V comp
Part be PWM high level part.
The system also includes compensation network compensation, the feedback voltage V comp is by compensation network
The voltage of compensation compensation, so that feedback voltage V comp forms gentle waveform.
As shown in fig. 6, wherein Iload is load current, IL is inductive current (electric current of inductance L in Fig. 2).When load electricity
When stream Iload reduces suddenly, filter network (the power filter network of Co and L composition in Fig. 2) is unable to maintain that Vout stable,
Vout voltage rises rapidly；When Vout and Vout1 voltage difference is greater than the first input threshold voltage that first voltage compares amplifier gm1
After Δ V1, the voltage of voltage output point Vgm1 declines, so that generation fluctuating current Itran corresponding with voltage difference is controlled, this
In electric current generation process it is similar with principle above, be not repeated herein.
Feedback current Iramp, feedback current Iramp electric current are generated after reference current Iref and fluctuating current Itran superposition
Increase, specifically, forward direction is the direction that electric current increases if comparing the direction of amplifier to flow out first voltage for forward direction, is equivalent to
Electric current is poured into reference current Iref, so that reference current increases；Meanwhile the feedback dentation voltage Vramp ramp signal of generation
Slope becomes larger；Feedback dentation voltage Vramp is compared with feedback voltage V comp, so that PWM wave is formed, due to feeding back dentation
The slope of voltage Vramp is larger, and the PWM wave pulsewidth of output becomes larger, and causes duty ratio SW to become smaller to control hd and ld, electricity
Inducing current IL declines rapidly, while Vout declines, to achieve the purpose that quickly to adjust output voltage Vout.
As shown in fig. 7, wherein Iload is load current, IL is inductive current (electric current of inductance L in Fig. 2).When load electricity
When stream Iload increases suddenly, filter network (the power filter network of Co and L composition in Fig. 2) is unable to maintain that Vout stable,
Vout voltage declines rapidly；When Vout1 and Vout voltage difference are greater than the second input threshold voltage that second voltage compares amplifier gm2
After Δ V2, the voltage of voltage output point Vgm2 rises, so that generation fluctuating current Itran corresponding with voltage difference is controlled, this
In electric current generation process it is similar with principle above, be not repeated herein.
Feedback current Iramp, feedback current Iramp electric current are generated after reference current Iref and fluctuating current Itran superposition
Reduce, specifically, negative sense is the direction that electric current reduces if comparing the direction of amplifier as negative sense to flow into first voltage, is equivalent to
Electric current is extracted reference current Iref, so that reference current reduces；Meanwhile the feedback dentation voltage Vramp ramp signal of generation
Slope reduces；Feedback dentation voltage Vramp is compared with feedback voltage V comp, so that PWM wave is formed, due to feeding back dentation
The slope of voltage Vramp is smaller, and the PWM wave pulsewidth of output becomes smaller, and causes duty ratio SW to become smaller to control hd and ld, electricity
Inducing current IL rises rapidly, while Vout rises, to achieve the purpose that quickly to adjust output voltage Vout.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention, it is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention, should be included in protection of the invention
Within the scope of.
Claims (11)
1. a kind of load transient response Enhancement Method of voltage-mode buck converter, which is characterized in that the described method includes:
Low-pass filtering is carried out to the output voltage Vout of voltage-mode buck converter, generates average voltage Vout1；
The difference of Vout and Vout1 is calculated, and carries out the amplitude waveform for the difference being calculated to be converted to fluctuating current
Itran；
Slope processing is carried out to the amplitude of fluctuating current Itran, generates feedback dentation voltage Vramp；Further according to feedback dentation electricity
The pulsewidth in Vramp unit period is pressed, modulation generates the transient response output voltage Vout of voltage-mode buck converter.
2. the method according to claim 1, wherein the method also includes: preset the first input threshold value
The input of voltage Δ V1 and second threshold voltage Δ V2；
The amplitude waveform of the difference that will be calculated carries out being converted to fluctuating current Itran, comprising:
When Vout-Vout1 is greater than Δ V1, the amplitude waveform of Vout-Vout1- Δ V1 is converted to the fluctuation electricity of respective waveforms
Itran is flowed, the obtained fluctuating current Itran is forward current；
When the difference of Vout-Vout1 is greater than zero and is less than Δ V1, fluctuating current Itran is not generated；
When Vout1-Vout is greater than Δ V2, the amplitude waveform of Vout1-Vout- Δ V2 is converted to the fluctuation electricity of respective waveforms
Itran is flowed, the obtained fluctuating current Itran is reverse current；
When the difference of Vout1-Vout is greater than zero and is less than Δ V2, fluctuating current Itran is not generated.
3. the method according to claim 1, wherein generation feedback dentation voltage Vramp includes:
The fluctuating current Itran is superimposed with preset reference current Iref and generates feedback current Iramp, according to feedback
The amplitude of electric current Iramp generates feedback dentation voltage Vramp.
4. according to the method described in claim 3, it is characterized in that, the method also includes: according to feedback dentation voltage Vramp
The rectangular wave for modulation is generated with the difference of feedback voltage V comp；Wherein, feedback voltage V comp passes through to reference voltage
The difference of Vref and the output voltage Vout by partial pressure amplify to obtain, and feedback dentation voltage Vramp is greater than feedback voltage
The part of Vcomp is the high level part of rectangular wave.
5. according to the method described in claim 2, it is characterized in that, the first input threshold voltage Δ V1 and the second input threshold
Threshold voltage Δ V2 is followed successively by the offset voltage that first voltage compares amplifier and second voltage compares amplifier；Wherein, the imbalance electricity
Pressure is preset fixed value, and the offset voltage is compared two output mos of the operational transconductance amplifier of amplifier by voltage
The output stage asymmetry of pipe generates.
6. a kind of load transient response of voltage-mode buck converter enhances system, which is characterized in that the system comprises low passes
Filter, voltage compare amplifier, ramp generator and voltage generator element；Wherein,
The low-pass filter carries out low-pass filtering for the output voltage Vout to voltage-mode buck converter, generates average
Voltage Vout1；
The voltage compares amplifier, for calculating the difference of Vout and Vout1, and by the amplitude waveform for the difference being calculated into
Row is converted to fluctuating current Itran；
The ramp generator carries out slope processing for the amplitude to fluctuating current Itran, generates feedback dentation voltage
Vramp；
The voltage generator element, for according to the pulsewidth in feedback dentation voltage Vramp unit period, modulation to generate voltage-mode
The transient response output voltage Vout of buck converter.
7. system according to claim 6, which is characterized in that it includes: that first voltage compares fortune that the voltage, which compares amplifier,
It puts and compares amplifier with second voltage；
Wherein, first voltage compares amplifier and presets the first input threshold voltage Δ V1, and second voltage compares amplifier and sets in advance
Fixed second input threshold voltage Δ V2；
When Vout-Vout1- Δ V1 is greater than zero, first voltage compares amplifier work, and first voltage compares amplifier according to Vout-
The amplitude of Vout1- Δ V1 exports positive fluctuating current Itran；
When Vout1-Vout- Δ V2 is greater than zero, second voltage compares amplifier work, and second voltage compares amplifier according to Vout1-
The amplitude of Vout- Δ V2 exports reversed fluctuating current Itran.
8. system according to claim 6 or 7, which is characterized in that the ramp generator is specifically used for the fluctuation
Electric current Itran is superimposed with preset reference current Iref generates feedback current Iramp, according to the width of feedback current Iramp
Value generates feedback dentation voltage Vramp.
9. system according to claim 8, which is characterized in that the system also includes error amplifier EA, are used for basis
The reference voltage Vref and output voltage Vout by dividing generates feedback voltage V comp；
Correspondingly, the voltage generator element, for raw according to the difference of feedback dentation voltage Vramp and feedback voltage V comp
At pulse width signal, the transient response output voltage Vout for generating voltage-mode buck converter is modulated to the pulse width signal.
10. system according to claim 9, which is characterized in that the system also includes compensation network compensation,
The feedback voltage V comp is the voltage compensated by compensation network compensation.
11. system according to claim 7, which is characterized in that the first voltage compares amplifier and second voltage compares
Amplifier includes operational transconductance amplifier and circuit mirror current；
The output stage asymmetry of two output mos pipes of the operational transconductance amplifier generates offset voltage；First input
The input of threshold voltage Δ V1 and second threshold voltage Δ V2 is followed successively by that first voltage compares amplifier and second voltage compares amplifier
Offset voltage；
The circuit mirror current is located at the output end that voltage compares amplifier, and the electric current of the circuit mirror current is folk prescription
To.
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| PCT/CN2016/084276 WO2017067174A1 (en) | 2015-10-22 | 2016-06-01 | Method and system for enhancing load transient response of voltage-mode buck converter |
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| CN108306504B (en) * | 2017-12-19 | 2020-10-09 | 晶晨半导体(上海)股份有限公司 | Transient response circuit of switching regulator |
| CN108566073B (en) * | 2017-12-19 | 2020-10-09 | 晶晨半导体(上海)股份有限公司 | Transient response circuit of switching regulator |
| CN108304022B (en) * | 2017-12-19 | 2020-12-25 | 晶晨半导体(上海)股份有限公司 | Overcurrent protection circuit of switching regulator |
| CN108233692A (en) * | 2017-12-19 | 2018-06-29 | 晶晨半导体(上海)股份有限公司 | A kind of soft starting circuit of switching regulator |
| WO2021082000A1 (en) * | 2019-10-31 | 2021-05-06 | 华为技术有限公司 | Switch mode power supply converter |
| US11258297B2 (en) * | 2019-12-30 | 2022-02-22 | Schneider Electric It Corporation | Inverter control strategy for a transient heavy load |
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Application publication date: 20170503 Assignee: Xi'an Chris Semiconductor Technology Co. Ltd. Assignor: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Contract record no.: 2019440020036 Denomination of invention: Load transient response enhancement method and system for voltage-mode buck converter Granted publication date: 20190430 License type: Common License Record date: 20190619 |